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2015 ; 35
(12
): 2154-64
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Genetic Analysis of Connective Tissue Growth Factor as an Effector of
Transforming Growth Factor ? Signaling and Cardiac Remodeling
#MMPMID25870108
Accornero F
; van Berlo JH
; Correll RN
; Elrod JW
; Sargent MA
; York A
; Rabinowitz JE
; Leask A
; Molkentin JD
Mol Cell Biol
2015[Jun]; 35
(12
): 2154-64
PMID25870108
show ga
The matricellular secreted protein connective tissue growth factor (CTGF) is
upregulated in response to cardiac injury or with transforming growth factor ?
(TGF-?) stimulation, where it has been suggested to function as a fibrotic
effector. Here we generated transgenic mice with inducible heart-specific CTGF
overexpression, mice with heart-specific expression of an activated TGF-? mutant
protein, mice with heart-specific deletion of Ctgf, and mice in which Ctgf was
also deleted from fibroblasts in the heart. Remarkably, neither gain nor loss of
CTGF in the heart affected cardiac pathology and propensity toward early
lethality due to TGF-? overactivation in the heart. Also, neither heart-specific
Ctgf deletion nor CTGF overexpression altered cardiac remodeling and function
with aging or after multiple acute stress stimuli. Cardiac fibrosis was also
unchanged by modulation of CTGF levels in the heart with aging, pressure
overload, agonist infusion, or TGF-? overexpression. However, CTGF mildly altered
the overall cardiac response to TGF-? when pressure overload stimulation was
applied. CTGF has been proposed to function as a critical TGF-? effector in
underlying tissue remodeling and fibrosis throughout the body, although our
results suggest that CTGF is of minimal importance and is an unlikely therapeutic
vantage point for the heart.